Kambuna, Bening Nurul Hidayah and Oediyani, Soesaptri and Salman, Della Izzaty and Kusnadi, Kusnadi (2021) The effect of composition and shape variations on compressive strength slag depressant. Teknika (Jurnal Sains dan Teknologi), 17 (2). ISSN 1693-024X

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Abstract

The steel-making process begins with a reduction process carried out in a blast furnace (BF) then continues with the refining process in the converter. In the refining process, there is a slag foam formed from the reaction of oxygen with hot metal. A slag depressant is required to reduce the production of foam in the slag. Slag depressants are made using paper mill waste, limestone, and slag blast furnaces. This study aims to increase the compressive strength of the slag depressant by varying the composition and shape variations. Variations in the composition used were with and without BF slag, while the shapes used were cylinder, round, and cube. The process of making slag depressants begins with the stages of mixing, compacting, and drying. Slag depressant drying is carried out in the sun for ± eight days. The slag depressant raw material was analyzed using the XRF method to see the chemical composition of the raw material. The resulting slag depressant was then analyzed proximate analysis, compression test, drop test, and porosity test. In this study, the best quality slag depressant with high compressive strength and low porosity values is the slag depressant in a cylindrical shape, and the ratio of paper waste to limestone is 80:20%. The resulting compressive strength value is 1207.5 N / cm2 and a porosity of 34.7%. The addition of BF slag in this study was proven to affect the compressive strength of the slag depressant. The highest compressive strength value was achieved by adding 10% slag blast furnace to 10%, 862.08 N / cm2.

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